The AV valves close when ________
A) ventricular systole begins
B) ventricular diastole begins
C) ventricular pressure drops below the pressure in the large arteries leaving the heart
D) atrial contraction occurs
Answer: A
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Burns are devastating and debilitating because of loss of fluids and electrolytes from the body. How do physicians estimate the extent of burn damage associated with such dangerous fluid loss?
A) by using the "rule of nines" B) by measuring urinary output and fluid intake C) by observing the tissues that are usually moist D) through blood analysis
In 1848, a railroad foreman named Phineas Gage was injured in an explosion, when a tamping iron penetrated his skull and caused brain damage; surprisingly, he survived. The rod was 1.25" in diameter and 3.5' long. After the accident he was able to speak, get himself up and down from a cart, and climb a flight of stairs to see the local physicians. Years later, the doctors reported that he
physically recovered, but the balance between his intellectual facilities and animal propensities was destroyed. He was no longer mild-mannered, kind, and respectful; he grew obstinate, ill-tempered, and showed little self-restraint. Based on this story, what area(s) of the brain (and/or systems) do you think he injured and why? What will be an ideal response?
What piece of safety equipment is essential when performing a dental cleaning, and what makes it essential?
What will be an ideal response?
During respiratory compensation for metabolic alkalosis,
a. breathing becomes shallower b. breathing becomes slower c. CO2 levels in the body decrease d. both a and b occur e. both b and c occur